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        <title>多媒体相关</title>
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    <h1>默认情况</h1>
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        <div class="box">
            <img src="https://mdn.github.io/css-examples/learn/images/star.png" alt="">
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        <div class="box">
            <img src="https://mdn.github.io/css-examples/learn/images/balloons.jpg" alt="">
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